This laboratory information is essential for an immediate management decision. The blood gas, blood glucose and electrolytes demonstrate that Lisa has diabetic ketoacidosis. It is important to calculate the corrected serum sodium in DKA as the hyperglycaemia may mask co-existent hypernatraemia. If the corrected serum sodium is greater than 150 mmol/L, correction of dehydration should be performed very slowly (48-72 hours) to minimise the risk of cerebral oedema.